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2024年2月7日发(作者：designer怎么读音)
The Piston-type Steam pressure reducing valve
Instruction manual
Configurations:
1
2
3
4
5
6
Lower cover
Body
7
8
Piston ring
Cylinder
Secondary valve spring
Upper bonnet
Secondary valve
Secondary valve seat
13
14
15
16
17
Diaphragm
Adjusting spring
Valve cap
Adjusting screw
Top cap
Main valve spring 9
Main valve seat
Main valve
Piston
10
11
12
Main performance and uses:
Y43H is principally used in steam pipe, it can reduce the inlet
pressure to a certain outlet pressure you need by adjusting the
1
spring, when the flow and the pressure of the inlet varies, the
outlet pressure can also remain within a certain range by the
strength of the medium itself, but the differential pressure of the
inlet and outlet must be equal or greater than 0.2MPa.
Technical parameter:
DN
(LB)
300
Pressure test (MPa) Pressure-adjust range (MPa)
export
pressure
Import
Shell test Seat test
pressure
7.5 5.5 2.5
Applicable
Temperature
export
℃
deviation
0.5～1.6
≤±0.7 ≤250
Working principal:
When the pressure reducing valve leaves the factory, the
adjusting spring is in uncompressed state, the main valve disc and
secondary valve disc is in close position. When you want to use it,
you can turn the adjusting screw clockwise; this can compress the
adjusting spring, move the diaphragm down and then open the
secondary valve disc, the medium also enters above the main
valve seat through “a” hole to “b” hole, make the main valve
disc open and then enters under the diaphragm through “c” hole.
But when the downstream pressure is exceed the set pressure, the
medium moves the diaphragm up and compresses adjusting
2
spring, and then the secondary valve disc closes slowly, because
the flow reduces, the downstream pressure get a new balance, on
the other hand, when the downstream pressure is less than the set
pressure, the gap between the main valve disc and the main valve
seat increases and then the flow increases too and then make the
downstream pressure get a new balance.
Installation and maintenance:
1. Clean the valve and the pipe line and remove the dirt before
installation, at the same time the valve must be installed in
horizontal direction, bracket is needed when the valve
deadweight is heavy or vibration exists at the site.
2. While installing, make sure the flow direction and the
direction marked on valve body is consistent, and a bypass
pipe is usually required. When the valve size and the pipe
size differ, reducer should be adopted. The installing site
should have sufficient space for a convenient usage and
maintenance.
3. When the valve is put into use, the bypass globe valve must
be opened, remove the condensate and the water vapor
mixture in order to avoid the water hammer occurred by
opening the valve. If there is no unusual phenomenon
3
appears, you can turn the adjusting screw clockwise till
getting the outlet pressure we need, then lock the nut and
cover the top cap.
4. A filter must be installed before the pressure reducing valve
which prevents the impurities from getting into the valve.
5. There must be a straight pipe at least 600mm and 1000mm
seperately before and after the pressure reducing valve.
6. A water-vapor separator and a steam trap should be installed
before the pressure reducing valve, atfter which a steam trap
should also be installed.
7. Pressure reducing valve should be kept in a dry room, both of
which should be blocked with blind plates. Do not keep in
piles.
8. If the pressure reducing valve will be kept for a long time, we
must check it regularly, clean up the dirt and spread some
rust-proof oil on the movement part and the machined
surface.
9. If the outlet pressure is higher than the inlet pressure, we
must reset the pressure reducing valve as follows:
① Shut off the upstream isolating valve;
② Relief the downstream pressure;
③ Turn the adjusting screw counterclockwise, make it in a free
4
poisition.
④ Open the upstream isolating valve slowly till full open.
⑤ Turn the adjusting screw clockwise, the outlet pressure rises
slowly to the set value, then lock the adjusting screw.
⑥ If you adjust the pressure too high, you must readjust it from
step 1 to step 5 (adjust from low pressure to high pressure only)
Installation diagram:
1 2 3
reducing
valve
4
Globe
valve
5
Safety
valve
6
Bypass
pipe
filter pressure gauge Pressure
5
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